One-rep max estimator

Estimate your one-rep max from a set of weight × reps, plus training percentages for loads.

Estimated in this browser. Nothing is sent anywhere.

Epley, Brzycki and Lombardi formulas for 1–15 reps; the spread gives a plausible range, not an exact max. Accuracy drops past about 10 reps. Enter a set you actually lifted to failure. Weight up to 1000 per unit.

How to use

  1. Enter the weight you lifted and the reps to failure.
  2. Choose kg or lb.
  3. Read the estimate and the percentage table.

What it supports

Epley, Brzycki, and Lombardi formulas for 1–15 reps; the spread between them is the plausible range, not an exact max — accuracy drops past about 10 reps. Weight up to 1,000 per unit.

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